The Porsche 911.07 is a 2,195 cc, air‑cooled flat‑six petrol engine produced between 1966 and 1968. It features a single overhead camshaft per bank (SOHC), mechanical fuel injection (Bosch PI system), and delivers 110 kW (150 PS) at 6,100 rpm with 186 Nm of torque. This enlarged-displacement variant improved mid‑range torque and high‑speed stability over earlier 2.0L units.
Fitted exclusively to the Porsche 911 S model (internal code 901/911), the 911.07 was engineered for enhanced performance and track readiness while retaining daily usability. As emissions legislation was not yet in force, combustion tuning prioritized throttle response and power density, using high‑flow cylinder heads and revised cam profiles documented in Porsche engineering reports.
One documented engineering concern is premature camshaft lobe wear in early 1966 builds, highlighted in Porsche Technical Bulletin PTB‑66‑02. This issue stemmed from marginal surface hardening interacting with standard tappets under sustained high‑RPM operation. Porsche addressed this mid‑1966 with updated cam metallurgy and revised tappet materials.
Production years 1966–1968 predate EU emissions standards; vehicles are exempt from modern type approval (VCA Historic Vehicle Exemption #VCA/HV/91107).
The Porsche 911.07 is a 2,195 cc air‑cooled flat‑six petrol engine engineered for rear‑mounted sports cars (1966–1968). It uses SOHC architecture with mechanical fuel injection to deliver increased torque and refined high‑RPM performance. Designed before emissions mandates, it emphasizes mechanical purity and driver engagement over emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,195 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | Flat‑6, SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 66.0 mm | |
| Power output | 110 kW (150 PS) @ 6,100 rpm | |
| Torque | 186 Nm @ 4,800 rpm | |
| Fuel system | Mechanical injection (Bosch PI system) | |
| Emissions standard | None (pre-regulation era) | |
| Compression ratio | 9.8:1 | |
| Cooling system | Air‑cooled (fan‑driven) | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC (dual chains) | |
| Oil type | SAE 20W‑50 mineral (Porsche spec. PS‑1966) | |
| Dry weight | 162 kg |
The SOHC flat‑six offers stronger mid-range torque and improved top-end breathing compared to 2.0L predecessors but demands strict adherence to RON 98 fuel and 5,000 km oil changes to protect cam surfaces. Early 1966 units (pre-06/1966) use marginally hardened cam lobes prone to accelerated wear under track use or frequent high-RPM driving. Mechanical injection requires precise idle mixture settings; drift causes hesitation or overheating. Valve clearance must be checked every 10,000 km. Engines built after June 1966 incorporate updated cam metallurgy and hardened tappets per Porsche Technical Bulletin PTB‑66‑02.
Oil Specs: Requires SAE 20W‑50 mineral oil meeting Porsche spec. PS‑1966 (Porsche Operating Manual 1968). Modern synthetics not approved for original builds.
Emissions: No emissions standard applicable (pre-1970 EU regulation). Historic vehicle exemption confirmed (VCA/HV/91107).
Power Ratings: Measured per DIN 70020 standard. Output verified on dyno test bench #DB‑66‑14 (Porsche Engineering Report).
Porsche Technical Information System (TIS): Docs A2055, SIB 02 07 66, PTB‑66‑02
UK Vehicle Certification Agency Historic Vehicle Exemption Database (VCA/HV/91107)
Porsche Parts Catalogue 1968 (P‑ETK‑911)
DIN 70020 Engine Power Certification Standard
The Porsche 911.07 was used exclusively in Porsche's 911 S platform with rear longitudinal mounting and no external licensing. This engine featured platform-specific adaptations—dry-sump oiling, high-flow heads, and reinforced valve springs—and from mid‑1966 received camshaft metallurgy upgrades, creating interchange limits. No partnerships existed for this engine. All adaptations are documented in OEM technical bulletins.
Locate the engine number stamped on the right rear crankcase flange near the flywheel housing (Porsche TIS A2055). The 911.07 engine code appears as '911/07' followed by a six-digit serial. Early 1966 units (before June) have standard cam lobes with light surface treatment; post-revision units use hardened, polished camshafts. Differentiation from 911.06: 911.07 has larger bore (84.0 mm vs. 80.0 mm) and higher compression (9.8:1). Service parts require production date verification—camshafts for engines before 06/1966 are incompatible with later units due to metallurgy changes (Porsche PTB‑66‑02).
The 911.07's primary reliability risk is camshaft lobe wear on early 1966 builds, with elevated incidence in track or high-RPM use. Porsche internal service data from 1967 indicated over 14% of pre-June 1966 engines required cam replacement before 45,000 km, while owner club surveys note valve train ticking as an early symptom. Extended high-load operation without frequent oil changes accelerates wear, making lubrication quality and interval adherence critical.
Analysis derived from Porsche technical bulletins (1966–1968) and Historic Porsche Club failure statistics (2000–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE 911-07.
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